In short, if you are a DK and another DK is stacking necros on you, Conversion heals aren't affected by battle fatigue and it heals you for 3% of your total health. Not only does it remove Necrotics, but it still heals you for that % of health. Also, if you are Lichborne spec and have say, 500k necros on you, just pop AMS and Lich heal. Your Death Coils are also unaffected by Battle Fatigue and heals you for that % of health. Typically 1 Death Coil will heal you for 50% of your max health. Just thought I should share.